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A fuel level sensor for use with a vehicle fuel tank includes a magnet carrying float assembly that rises and falls with the fuel level to open and close various magnetically activated reed-switches located at different axial positions along a vertically extending electrical circuit. Activating a re

A fuel level sensor for use with a vehicle fuel tank includes a magnet carrying float assembly that rises and falls with the fuel level to open and close various magnetically activated reed-switches located at different axial positions along a vertically extending electrical circuit. Activating a reed-switch located at a particular vertical position along the electrical circuit causes the overall resistance of the circuit to depend upon the position of the float assembly. The float assembly is capable of freely rotating about the vertical axis of the electrical circuit and carries magnets producing a horizontal magnetic field that can activate a reed-switch from any angular orientation of the float assembly. Thus, assuming the fuel level sensor is provided with a constant voltage source, the sensor is able to determine the fuel level by the amount of electrical current flowing through the circuit. The electrical current outputted from the sensor is sent to a fuel level gauge which translates the electrical signal into a visual reading, thereby informing an operator of the current fuel level.

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A fuel level sensor for use with a vehicle fuel tank includes a magnet carrying float assembly that rises and falls with the fuel level to open and close various magnetically activated reed-switches located at different axial positions along a vertically extending electrical circuit. Activating a re

A fuel level sensor for use with a vehicle fuel tank includes a magnet carrying float assembly that rises and falls with the fuel level to open and close various magnetically activated reed-switches located at different axial positions along a vertically extending electrical circuit. Activating a reed-switch located at a particular vertical position along the electrical circuit causes the overall resistance of the circuit to depend upon the position of the float assembly. The float assembly is capable of freely rotating about the vertical axis of the electrical circuit and carries magnets producing a horizontal magnetic field that can activate a reed-switch from any angular orientation of the float assembly. Thus, assuming the fuel level sensor is provided with a constant voltage source, the sensor is able to determine the fuel level by the amount of electrical current flowing through the circuit. The electrical current outputted from the sensor is sent to a fuel level gauge which translates the electrical signal into a visual reading, thereby informing an operator of the current fuel level. R. Allan Freeze, J. A. Cherry, Groundwater, Prentice-Hall, Inc., Enalw. Cliffs, NJ., 1979 pp 15-77. W. D. Reynolds, E. D. Elrich, A Reexamination of the Constant-Head Well Perm. Mthod. for Meas. Sat. Hud. Cond. above the WT, Soil Sci, 1983, p 250-268. A. Amoozegar, A. W. Warrick, Hydraulic Conductivity of Saturated Soils: Field Methods, Soil Science Soc AM, Madison, Wi., 1986, pp 735-770. W. D. Reynolds, D. E. Elrich, Laboratory and Numerical Assessment of the Guelph Permeameter Method, Soil Science, vol. 144, pp 282-289, 1987. A. Amoozegar, A Constant Head, (compact) Permeameter . . . , Comparison of the Glover Solution . . . , Soil Sci. AM, vol. 53, 1989, pp 1356-1367.